The mass-loss evolution of oxygen-rich AGB stars and its consequences for stellar evolution

Details The mass-loss evolution of oxygen-rich AGB stars and its consequences for stellar evolution The mass-loss evolution of oxygen-rich AGB stars and its consequences for stellar evolution

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..127v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 127-146. Research supported by ASTRON and ZWO.

Astronomy and Astrophysics

Astronomy

56

Asymptotic Giant Branch Stars, Infrared Stars, Mira Variables, Stellar Evolution, Stellar Mass, Hydroxyl Radicals, Infrared Astronomy Satellite, Metallicity, Oxygen, Stellar Envelopes, Stellar Luminosity

Scientific paper

A semiempirical mass loss equation (MLE) for Asymptotic Giant Branch (AGB) stars with oxygen-rich circumstellar shells is presented. The MLE is a function of stellar luminosity, expansion velocity of the circumstellar shell, and the ratio between the IRAS 25 and 12 micron flux densities. The results are compared with previously derived MLEs. The IRAS Point Source Catalog is used to find the mass loss as a function of time. The MLE is tested by estimating the total mass lost on the AGB. A simple expression is found relating the initial main sequence mass and the maximum AGB luminosity. The time-dependent properties of the MLE are tested using a sample of Miras and OH/IR stars. A relation between period, luminosity, and stellar envelope mass is found and compared with the observed period-luminosity relations for globular cluster Miras and Miras in the LMC. Good agreement is found.

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